The Impact of Cr³⁺ Doping on Temperature Sensitivity Modulation in Cr³⁺ Doped and Cr³⁺, Nd³⁺ Co-doped Y₃Al₅O₁₂, Y₃Al₂Ga₃O₁₂, and Y₃Ga₅O₁₂ Nanothermometers.

ABSTRACT: A new approach to enhance the sensitivity of transition metal ion based nanocrystalline luminescent thermometer is presented. It was shown that the increase of Cr³⁺ concentration in three types of garnet host namely Y₃Al₅O₁₂, Y₃Ga₅O₁₂, and Y₃Al₂Ga₃O₁₂ allows for significant enhancement of their performance in non-contact thermometry. This phenomenon is related to the weakening of the crystal field strength due to enlargement of average Cr³⁺-O^2- distance at higher Cr³⁺ concentrations. By increasing Cr³⁺ concentration from 0.6 to 30%, the sensitivity increased by over one order of magnitude from S = 0.2%/°C to S = 2.2%/°C at 9°C in Y₃Al₂Ga₃O₁₂ nanocrystals. Moreover, it was found that due to the Cr³⁺ ? Nd³⁺ energy transfer in the Cr³⁺, Nd³⁺ co-doped system, the usable Cr³⁺ concentration, for which its emission can be detected, is limited to 10% while the sensitivity at -50°C was doubled (from 1.3%/°C for Y₃Al₂Ga₃O₁₂:10%Cr³⁺ to 2.2%/°C Y₃Al₂Ga₃O₁₂:10%Cr³⁺, 1%Nd³⁺ nanocrystals).

SUBMITTER: Elzbieciak K 

PROVIDER: S-EPMC6157326 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature